Title:
グロープラグの製造方法及びグロープラグ
Document Type and Number:
Japanese Patent JP6771964
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To suppress fracture at a connecting point between a tip coil and a rear-end coil.SOLUTION: In a manufacturing method of a glow plug, the glow plug comprises: a sheath pipe which extends to an axial line direction, and whose tip is closed; a tip coil which is arranged in the sheath pipe, and connected to a tip part of the sheath pipe; and a rear-end coil which is arranged in the sheath pipe, and connected to a rear end part of the tip coil. A main component of the tip coil is tungsten (W) or molybdenum (Mo), and a melting point of the rear-end coil is lower than a melting point of the tip coil. The manufacturing method includes a welding process for welding the rear end part of the tip coil and a tip part of the rear-end coil so that at least a part of the rear-end part of the tip coil is embedded into the tip part of the rear-end coil while being surrounded by the tip part by melting the tip part of the rear-end coil.SELECTED DRAWING: Figure 5
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Inventors:
Hirofumi Okada
Application Number:
JP2016129647A
Publication Date:
October 21, 2020
Filing Date:
June 30, 2016
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
F23Q7/00
Domestic Patent References:
| JP2015099008A | ||||
| JP2000097434A | ||||
| JP2009156560A | ||||
| JP2000130752A | ||||
| JP2012057820A | ||||
| JP2014059086A | ||||
| JP2006125776A | ||||
| JP58158425A | ||||
| JP2014137170A | ||||
| JP2015014393A |
Foreign References:
| WO2011162074A1 | ||||
| US5468933 |
Attorney, Agent or Firm:
Meisei International Patent Office